The graphics are great! Worth the 500mb download. I like the gameplay too, I grew up playing a lot of platforming games. I felt that the solar flare took way too long, especially whenever I was already near the shade. You should reduce the duration but make it do more damage because the warning already gives you enough time to find a safe area. I think you should change the controls too. It would be easier to play this game with Space bar + D-pad rather than WASD. My reasoning behind this is because while you're wall jumping, you need to hold the direction in order to perform it. It's easier to split the work between your hands rather than doing it all with one hand. I even tested this by remapping WASD to my D-pad.
Overall, great job on the game! Now I want some tacos.
Also, I crashed the game somehow while I was wall jumping.