Thank you so much for the great feedback! I am happy to hear you like the presentation, I really spent a lot of time on making everything feel right. I'm also glad you mentioned natural evolution, I tried to make every aspect in the game get harder over time. In terms of enemy types, yes, that's certainly something we could enhance, however my friend who made all the art already was dying inside and sitting late at night making all the different enemy sprites and animations, so this sadly wasn't possible.
Thanks again for the detailed comment!