It was a neat lil concept, I like the idea! As Jon said the particle effects are pretty great, especially the massive wave of fire at the end of each level and the screen shake, both added alot to the game ngl. I also liked that you could kill the Pingolems with the ball of fire which was the most fun and satisfying part for me. Arena mode was also a nice touch, as well as the LOL and marshmallows at the end.
As for parts that faltered slightly, the slight delay after kicking where you cannot move is for most times fatal, and the pingolems are a liiiittle too fast in my opinion, especially since they can go through walls. Last part is that it was hard to tell if I could kick the ball of fire sometimes, at times I just held space and stood there like an idiot.
If I could change it, it would be that instead of there being a meter, you just hit space and it just instantly launches the ball in the angle away from you at a set strength ,tune up the heating speed, and make the pingolems about 2/3s of the speed. You get to kick the ball quicker and kirr more pingolems (admittedly the game would be easier and Im sure you guys needed to pad out the game time somewhat). Just a suggestion tho, im sure there are even better ways.
Other than that it was a pretty good entry, especially for the time constraint, and with further tweaks and stuff this has some potential, I mean POTENCH.