I wish the game was developed juuust a little bit more. The gameplay is fun, but not a lot is "changing" when playing it, if you know what I mean?
But I liked the controls, it felt good. Very nice little game in fact!
Thank you for your feedback! I definitely know what you mean. Somethings that I'd like to explore are
progressive waves with more difficult enemies
post-wave screen to power up weapons or health
enemy swarms ( low level but tons of them)