In comparison with other game by the same company that is a year older - Titus the Fox; this is also not an easy platformer game, however the difficulty is challenging, but also reasonable, unlike Titus the Fox's later maps are, in my opinion of course. This game has great replay value and I always kept dying quite a lot mainly in later maps, but it doesn't ever get frustrating and that's a good thing.
however, this game gets too difficult from like map 8 onwards. If you never played this game as a kid, I don't recommend this game, it might get too hard even sooner than that for you. There is a cheat code to activate infinite lives, which I remember using back then. However, I don't remember how to activate it, so I can't make it through this game anymore :D, oh well. Also if you use a password to start from a certain map, you'll only get 3 lives, it's just not enough to get through some hard maps, even though I played this game before. 3 stars probably only thanks to nostalgia factor. If I never played this before, it would be probably only 2 stars.
I personally had to get source port for all FPS titles in this pack - CatacombGL. 2D games I played DOS originals. FPS games in this pack are fairly repetitive, but really not bad, though it I had enough after about an hour of gameplay per day. However these games are fairly short (about 90 minutes per title in average), so it won't take long. 2D games are pretty good for when they were made. Same as in FPS games, there are shootable walls that are mandatory to proceed in maps, so keep that in mind.