Must say i'm a bit sad GOG, You didn't mention Giant Citizen Kabuto, Freespace, Descent, Toonstruck which are all fantastic while Unfinished Business isn't even the great JA2 but whatever.

A few more questions:
1. Do you need to eat and drink to survive? (Dungeon Master has food and water meters for each character, and if you don't eat or drink for too long, you end up losing stamina and eventually health.)
2. Can you make a potion with a spell, like you can in Dungeon Master?
3. Do enemies respawn? (Dungeon Master had monster generators which, when triggered, would generate more monsters, but didn't otherwise have respawns.)
4. Can you have the party rest at any time to get back health, stamina (if it's in the game), and mana?

1 - No, there isn't anything like a "food meter" here. You do have food and a water pouch that you can fill with water from a healing fountain, but their use is just healing in the middle of combat (opening the inventory pauses the combat, so you can munch a dozen roots and get full health in the middle of fight) or afterwards.

2- There isn't crafting in this game, (other than finding the pieces of a dwarven stonethrower that you won't use anyway and giving them to a dwarf to assemble) but I do remember a couple temporary strength potions you can find lying around. They don't matter, you can max out your character's stats easily. I don't remember any other spell potions.

3- No. Enemies are finite, except for a couple very specific points that spawn extra. I remember some wasp nests that spawns a new wasp when you kill the previous until you decide to destroy the nest itself. There is also a hole in a wall in the first or second level that infinitely spawns the most basic enemy in the game, a big ant. Other than those every enemy you kill is one less enemy you'll have to face.

4- First of all I need to clarify a thing: there actually isn't a mana stat. Your mana is intrinsic to the spell staves. Each staff has their own mana charge that depletes as you use them, but they are rechargeable. I'll get to it soon. There is no stamina stat either.

So, back to your question: there isn't a party rest mechanic. You can stop pretty much anywhere you want, but you gain nothing from staying still (and in a few places enemies roam the corridors more actively). This means in the early game you need to backtrack a bit until the healing fountain, or heal with consumables. Later you find a mana recharge circle, and by then you already have the healing rune that is your first spell. So you stop backtracking to the fountain and start BTing to the circle instead. It becomes easier later when you find a teleport rune and you set the destination spot just beside the mana circle. As you go deeper and deeper you find new mana circles, thankfully.

And all that becomes infinitely easier around 60-70% of the game in, when you find an orb whose power is a "portable mana recharge circle". From then on you're a killing machine that never needs rest nor backtracking unless to take a new path.

BTW, here's an unrelated hint for you: when you find Saturn, put/throw it in the ground in front of you.

Earthworm Jim 1+2 i am kinda refusing to buy it. Don't have the sega mega drive versions anymore but i never really liked that extra level in 2 that was timed so missing that one level wouldn't be a pain if i ever get this. I do hope they still have the level before the quiz and that flying ballon tnt level in it.
But i heard some control problems in 1 or 2 or both. Is it possible to reasing the keyboard configuration so i could shoot in all directions?