Great entry! It's quite easy as far as roguelikes go, but the mechanics are solid and the sprites are cute.
A few things I disliked:
- enemies could shoot diagonally, but you couldn't
- sometimes you'd enter a room and get immediately hit by enemies near the door
- I never found a good use for the shield and pretty much ignored it through the entire run
The UI for selecting upgrades was really nice, and the music was pretty great too.