I like the idea of adjusting the player's jump height and gravity to get through the levels. But the game needs some work. Once the voting period is over, I would recommend that you do the following to fix the game:
-Make the spike's hitbox smaller. I kept on running into them at the very beginning of level 4 even though I didn't touch them.
-Avoid blind jumps. For example, in level 3, I had jump meter all the way up and the gravity meter all the way down. I jumped for as long as possible and missed the goal. On my second attempt, I tried to not jump as high as possible and ended up missing the goal again by a few blocks. Have some sort of indication as to where the player will land or where they are going when they are jumping high up into the air.