Absolutely love the presentation and the collection of well executed game mechanics. Huge fan of time slow and teleportation. I wouldn't redesign the system, like Aru suggested, but i would advise on slowing time and not stopping time. Also would like to see a cool warping effect when teleporting, with some nice sound effect.
What i enjoyed less is just how many bullets there were at certain times. I always had to fit in a tiny island in the sea of bullets. Killing enemies felt like adding a drop of water into a 10l bucket. If i just could blast it with the hose more often, the tankiness would not be a problem.
What i liked most is that it didn't feel like the jam game, but more of a full experience.