I'm glad you enjoyed it! Yeah, it was started and finished in two weeks :). I think part of it was, I forced myself to only implement this things that I initially planned (which is historically really hard for me to do)! I actually more or less had enough time work on polishing for the last few days.
As far as the enemies go, that's actually one of the first things on my list of things to improve. I even debated taking them out entirely, but I decided they add something to the gameplay, even if they are too easy right now. Definitely a proper cooldown too.