Like someone else mentioned, this game felt a lot like agar.io, but solo and with slime food! I liked being able to upgrade at each level, and I liked the dash mechanic, but just a couple things.
The meteors are a little unfair. I don't even mean the damage, I mean that there's no way to see them coming until they're hitting the ground. If there was some sort of glow or something above where one was appearing, it would feel a lot more fair when I get hit by it, because as it stands, it feels more like luck than anything else.
As someone mentioned, the jumping didn't have a whole lot of use. Totally understand running out of time though, it happens, not really knocking you for that!
I also didn't really understand the connection to the theme, to be honest. I didn't finish the 5 minute timer though, I tried a number of times but it seemed like any time I got below two minutes, meteors would just not stop spawning, and like I mentioned earlier, there wasn't really a way to know when they were coming so I just felt like I got killed for progressing. Either way, maybe there would be a more clear connection to the theme if I made it through the timer, I don't know, but as it stands, I don't really see the connection.
Overall, great job! I really liked the art and the gameplay was simple and fun!