This is a really cool idea! I wasn't sure about the random seed mechanic at the start but it adds a little bit more contorl (and feeling of influence) back to the player, AND it keeps the levels interesting. It also adds a nice psychological element where I need to decide whether I can beat the level with the current seed or gamble for a new one.
The platformer controls felt pretty good to me, but could be tightened up slightly in a few places. The wall slide/jump was a nice touch! Overall, the game is polished and feels nice to play. Great work!