Right from get go - I LOVE how crisp and detailed everything looks. It so hard to make monochrome work, in my opinion, but you nailed it so well. Its great.
I saved 8 cats only first time though (but managed to escape first attempt 1409 points). Second attempt I found all cats (7 this time), but haven't found exit and died after unfortunate Gug encounter bringing me a bit too low. Dungeons looks like at least partly random generated? Replayability with scores - nice!
Would like to have something like health potions to heal after Gugs! Maybe some shop to spend gold in future?
(Also, if I may... can you make so your engine is a little bit less messy? I mean folder specifically... maybe make subfolder with all resourses (maybe even pack them?), so they are not laying there all open? Its not a totally big deal, but it may be awkward for future more mass user.)
Thanks for that entry, had loads of fun collecting cats! Meow! :)