Such a cute game, I like the idea so much and the core mechanics are really there. It just need a litte polish I think and this would be a real gem. Keep it up! 

It really like the idea of evolving up and down. The art also looks very nice. The gameplay was a bit rough though.

The core idea and implementation I really like.  Being able to select your evolution at any point once you have the crystal is really empowering.  I liked it.  Yes a reset button would be nice and yes I am sure you could achieve a lot more in terms of level design given time.  This is a jam though and as a flavor and an expression of your ideas.... I like it a lot!  If anyone saw the balloon coming and wasn't surprised and pleased... I'll eat my hat :)

great idea for a game, but I suggest you to come up with a reason to evolve and devolve,

like some place can only be past by using certain form, or each form has it's own unique advantage and weakness.

Pretty nice and cute game, balloon evolution was ZOOOMING!

There are of course some issues with the game, but for a first project that was really good!

I got stuck due to box moving to far instead of blocking the laser :( I could have used a reset button.

I wish I could play more because I like puzzle platformers. 

Actually finished your game, art for evolove stages are very cute!

i collected the first crystal, but jump didn't work so i was not able to proceed through the first laser.

but i like the idea tho. :-)

I pushed the second block the wrong way and got stuck first time I played. Nice little game though