Thanks for the feedback, I plan on releasing an update addressing these problems after the jam! The beginning is a little too slow indeed, there are too few enemies and platforms.
What do you exactly mean by "gain more momentum when grounded" ?
When you're in the Lava, you move really sluggish and have to jump to get out/gain momentum. I just feel like the jumping action should have a little less allowed momentum, requiring you to spend a short amount of time in the lava to project yourself further.
You already move at half speed in lava but you are right, the jump is so overpowered it doesn't present any danger at all. I was thinking of some system where the jump is like an ability that has a cooldown and air jumps are additional charges you can collect.
I guess what I'm trying to say is take off the half speed in lava and tone down the jumps. I think that would be an appropriate route, making the upgrades increase the rate the ability/meter fills. Once you get it figured out, I'm sure you'll find plenty more to do :P
