First of all this looks great visually. The shading is very pretty. I think the gameplay could be a bit stronger though. As a couple of commenters have mentioned, there's not very much feedback as to how well you're doing. I also feel like the mechanic is a bit underutilized. Past the first few levels, once the crystal has moved away from the center, it's actually pretty easy to just forget that it's even there. I also think that the enemy hitboxes should be a bit larger, there were many times in which it seemed like I should have been hitting them, but my bolts just past right through them. I do however like the general gameplay loop, with the arena getting larger as your progress. Perhaps without the 48 hour time limit, that idea could have been expanded even further, with different enemy types and environmental props or objects as the player progressed. Pretty cool overall!