This game is... weird. I love the concept and it fits the theme really well, and the presentation is pretty good, but the main mechanic isn't implemented that well. It's honestly ridiculously easy on any difficulty but Super Hard, and Super Hard is just straight up impossible.
It comes down to at least three things. First is the random generation. It's not at all a good fit for this style of game. Most of the time it throws spikes far away from the player, making it too easy to avoid, whereas other times it puts them in the middle of the jump, making it impossible. Super Hard just spams spikes everywhere, making the different platform irrelevant.
Secondly is the player AI. It's too simple, I feel. I was able to beat basically every level by placing my mouse where he'll land after the jump and then just getting the timing for placing platforms right. He needs to try and go for the coins, or avoid spikes.
Thirdly is the platforms themselves. Placing down one tiny platform every time you click is very limiting. I'd really suggest allowing you to at least drag-click to place more platforms, or something.
Overall, there's a core of a good game here, it just needs a lot of polish.