This game's visuals are excellent. However, as is usual for Trijam games, it could be improved a lot. The player can walk off-screen. I would probably put some barrier around the edge or just off-screen (my submission this week also is missing this). I loved the Big boss. Something went wrong with my plays. The Boss just stood there spamming; I ran out of power and then continued, I could not die, ending up with negative power.
If you developed this further, it would have a lot of potential, and with some animation, it would be a great game.
Well done