The frog's animation is a bit weird.
You have to click next level twice to proceed.
I glitched into a block and got stuck, then a box killed me.
With how the levels are designed there is a really simple way to win every time (assuming the blocks don't glitch), which ruins the fun once you find it. How to win any design: (SPOILERS, obv)
1. hop to the block next to the platform containing the door
2. let two blocks fall on the column you're in (Don't move unless you'd die)
3. move one block away from the platform containing the door and let a block fall on it.
4. repeat steps 2 and 3 until you can jump to the platform containing the door.