Cool game!
Feedback:
1. I enjoyed the format here, this room-2-room rogue like genera is one where players bring a lot of assumptions & expectations, and those can be difficult to meet. This game managed to meet them for me. The room by room exploration reminded me of playing The Binding of Issac or A Wizards Lizard.
2. Some of the mechanics could have done with a little more feedback. EG the attack. I wasn't aware of the range of my attack since there was no animation. Also because the attack only activates when an enemy is in range, I wondered for a while if I was pressing the correct button. This would be easily fixed even by just adding a baton/sword/knife in the character's hand. It would have been a little clearer what to expect.
4. I felt that the rooms could have done with some more variety than differing amounts of enemies. Maybe even just different enemy types, slower but more powerful for instance. Although this may have just been a symptom of time limitation set by game jam. (I might also have missed it) Even if there's just one power up per level, it gives me something to look forward to.
5. Good job with the sound! I liked the wooshing sound when I attacked.