I love the Mario like controls (and design) of the player character, very fun! I also love the level design and how you can find subtle ways to conserve jumps (e.g. using the lifts to get you over a bump). The timing mechanic of the bomb blocks was also very engaging as it forced me to think quick. I'd love to see more levels where all the different components interact!
As for critiques: controls. That's my only critique. The cluster of [z],[x], and [space] got really confusing and frustrating when any kind of time pressure (the bomb blocks) was applied. I've noticed this problem with many other games that use this control scheme, it's the fact that no one can agree on what should be jump and what should be shoot. I've seen space and shoot, x as jump; z as shoot, x as jump; x as shoot, space as jump. There's so many ways to approach this control scheme and every one does it differently--it's just soup in my brain. I would propose the following: Arrow keys for LR movement and JUMP, SHIFT for sprint and Z for shoot. That way you have tactile differences between the shoot and sprint key and jump fits in with the other movement controls.
Overall, when I wasn't frustrated at the controls, it's an excellent platforming experience. Unique level designs and fun puzzles. Good luck with whatever you decide to do with the game!