It's quite a simple and fun experience! The concept is quite simple and I like the premise of collecting crystals to keep yourself alive before the time runs out. I feel like there's definitely a lot of polishes to be made! It's rough on the edges but the core gameplay is fun. I got to ~240 score and I got the hang of the game pretty quickly.
First the game design could be better. There are way too much crystals to the point where it doesn't really matter what path you take since there'll always be crystals. You need to make your core mechanic shine, so the crystals should be designed to complement it! I think making the crystal reward risky play (eg, put crystals over the rocks so players are incentivised to risk jumping over it) will make the game a lot more alive, since then the player will actually have a reason to jump and try risky behavior that gets rewarded. Of course you should still put some crystals that are free so players aren't immediately dead, but it'd be nice to reward risky play. That I think is the weakest part of the game and it's what makes the game stale after a few tries!
The powerups are a nice way to spice up the gameplay! I really like those. But again, there is no reward for actually using it. For example the speed powerup. Since crystals are just laying everywhere, there is no reason for me to use the speed powerup if I can just walk at a normal pace and pick up enough crystals to stay alive. I also never got to use the double jump mechanic, I don't know if I'm just using it wrong but I never got it to work.
I really love the gameplay concept and I think there's a lot of potential in this idea! Keep polishing the game and try to design the game to make your good gameplay into great gameplay.