I won! And I totally, absolutely did not skip a level...
I genuinely think the theme has not helped you here at all. This game is insanely good, but so punishing because of the timer. I think if it was completely removed; it would be one of the best games I've played this jam, and probably something bigger if you wanted to revisit it. The shooting while grappling and flying through the air is so satisfying, but is hard to enjoy when your heart is about to explode.
For what it's worth I did enjoy it, but I think the time pressure takes energy away from all the other great things about the game to love, but alas that's the theme.
I think the biggest low hanging fruit would be a time slider, or another non-combat means to extend it and take some of the pressure off. I personally would love it if grappling gave you a little time back, and you chain grapples you can claim a good chunk of time back.
The boss fight is wicked, it was a really nice surprise as I wasn't really expecting it. Visually it's nicely consistent and the assets fit together well. The music and sfx are equally good in that respect. The oil slick shader is lovely, and the floating damage text has some really crunchy juice to it.
This is a great game, being shackled a little by the theme I think! Shackles off and you could make this into something bigger. Thank you.