I like the balance of picking up certain kinds of gems over time. It gets a little repetitive (to be expected), as there aren't many things to do differently each time once you've found a good route.
The gameplay is lacking in mechanics to keep things interesting. I wish there was something more than a down-to-the-wire timer to make gameplay difficult. You can't even get to the end faster with good technique, because so long as you hold forwards and don't hit a wall, the player moves at the same speed, so it feels like the game is trying to punish you for imperfection, which I do not enjoy.
I like the player sprite a lot, but even a single frame for being mid-air would be a major improvement over continuing the walk cycle, maybe even one for when moving up and another for moving down. The spike sprites should be a higher resolution to match the rest of the world.
