I really enjoyed this game, the art was very nice, and the music was good too!
The platforming itself was pretty good, but there are probably a few small improvements - grace timers for jumping from ledges and activating the boost (since you can't boost on the down arc of a jump, it made timing the boost on the peak of the arc feel really bad, and I changed my strategy to boosting early way more than I wanted to, which just didn't feel great.) Grace timers on killing the enemies could also go a long way. And maybe a slightly reduced hitbox on the hazards? Overall, I had fun playing - but when I died, it never felt like /my/ fault, and I think making sure the players feels like it's their fault when they die is a major component of successful rage platformers!
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Like, when you walk off the ledge, you don't start falling for like 0.1 seconds or so. Same with the boost, you can still boost for like 0.1 seconds after the peak of the jump. Just so that when you try to jump /right/ at the edge or boost /right/ at the peak, you can do it more consistently.
I think I've seen that idea called "Coyote time" before.