Unfortunately echoing the same complaints as everyone else, but also the same compliments! The art has a very cute style (though there's very little avenues through which to enjoy it, since it's not like the enemies change)
In future, for a small scope game like this (especially for a game jam), it's usually better to really decrease time limits by a lot more, and increase the rate at which you level up. For a shortened survivors-like this unfortunately misses anything that normally would make it fun, which is the insane ramping up in both number of enemies and power of the player, and ends up quite boring even like 30 seconds in. You need more level ups, a higher ceiling for abilities and a shorter timer. By minute 4 I had already fully upgraded both of the weapons so there really was no reason to play any further.
Sorry to be so harsh about it but I thought I should be honest! It is a game jam so I can appreciate that this isn't necessarily your best foot forward, so I hope you don't take it too hard. Great work on submitting!