Mother Gunship is a FPS Bullet Hell arena fighter that is reasonably forgiving and has a fun gameplay loop.
You launch from your spacestation on a pod, crash-breaching into a massive enemy ship at some random point, then fight robots to the death room by room until you get to the big red "Don't press me, I blow up the ship!" button and press it. Dying means losing the kit you went in with, winning means getting rewarded with new kit. By "kit" in this case I mean "guns and things that bolt on to guns".
There's a plot. It doesn't take itself too seriously, but it has just enough "WTF is happening??" going on to keep things interesting, and while not serious it is pretty well paced and internally consistent with things to discover and well structured beats. The characters are ... well, characters, and I enjoyed their banter throughout my playthrough. The major beats of the plot manage to be both ominously sinister and inspirational, building up to a finale that had me laughing and giving a golf clap to the creators for their audacity and how they 'finished' the game.
Weapons mostly feel different. A bounching sawblade launcher plays differently than a railgun. The attachments can enhance the weapon's strengths or just make it a different animal. You've got two weapon points - left click fires one, right click the other. Ammo comes in the form of 'energy' which recharges over time, and different weapons and attachments consume varying amounts of juice. This has a pretty solid natural balancing - while many builds are better than others, and some components are more efficient than other otherwise identical components, in general you end up with weaker weapons you can fire all day or stronger ones that burn through your 'magazine' in no time at all. It's a very well designed system that has a lot of variability without requiring min/maxing, but which gives you the opportunity to if you want.
Enemies and room turrets can turn the screen into a wall of bullets, but dodging and weaving is fluid, intuitive, and reasonably forgiving. I ~think~ the game even cheats a bit in your favor if you're being shot at from behind. When you're in a flow state it feels great, and the game seems designed so that rooms make it easy for you to slip into that position. Getting hit is pretty forgiving, too - if you're not wildly over your head you can almost always pull through unless you get into a mistake spiral.
The game just feels great. Plotwise, you're obviously in over your head and just pushing forward with a blind optimism that feels too stupid to fail, and that remains strangely inspirational until the end. Your mech both feels nimble and captures the Power Armor Fantasy sense of being wrapped in an unkillable steel warframe. The shooting feels powerful, the colors and lighting throughout the levels are fun, and stomping a multi-ton mech on a big dumb self destruct button never gets old.
I had quick load times, and I think it crashed once over about ten hours.