Make him jump higher.
On my first playthrough, at least 50% of the time I used was wasted, because the person couldn't jump high enough, therefore I thought getting those dots was impossible, and were left for your later evolutions.
This is a big problem, actually. To collect those dots, you literally need to stand until one pixel of your leg is left on the platform, then you jump to collect a dot.
This isn't adding "hardness" to the game, a game like this where you just collect things is not supposed to be hard, it's the easiest thing to do. The only thing you're doing is just making it fucking impossible. Either do one or the other:
1. Extend platforms or elevate them so jumping and collecting dots is possible or
2. Make the person jump higher.
Other then that, I enjoyed playing this game, albeit it being a bit frustrating. I thought the concept was unique, and I can't say I got tired of the music even though I played through the game three times (thank goodness for the invisible timer being frame-based...) through.