Very fun game! You managed to implement a lot in just one month which is really impressive; I love the enemy variety, the different abilities and upgrade system, and the general dungeon-crawling gameplay! I think my main point of feedback would be some of the upgrades seem to be more of downgrades, or sidegrades that I didn't know would happen. An example of this would be the ranged attack turning into an aoe around me, where I much preferred the ranged boomerang attack, especially because the aoe had an animation time that locked me in place. All of these can be fine-tuned though, the foundation you have is excellent!