A short and simple game for sure. It was easy to tell that this was a nod to EVO: Search for Eden, which made it a nice homage given the game was terribly underrated. But I digress.
As mentioned, the game was simple, but perhaps to a fault. Other creatures were either food or obstacles; there were no true "enemies" per se, aside from maybe the jellyfish. Having more creatures that can both kill and be killed would add an element of challenge to it, and make the gameplay more dynamic. There's also the common video game staple of having a final boss, which would help differentiate the "clear the dinosaur stage" medal and the "beat the game" medal (which are essentially two medals for the price of one at the moment). It's just something that could help the gameplay be a bit more interesting, since overall it's the same from start to finish.
The controls were decent, but the mechanics could use some work. The bite-box is pretty darn small, to the point where I'd be right on top of something yet fail to eat it. This can be a mild annoyance when having to jump to reach something. Having to completely restart the level upon dying seemed a bit monotonous, though given the simplicity of the game this wasn't much of an issue.
And on a minor note, you might want to lock the background in the dinosaur stage. Personally, I found it very off-putting that the background would "scroll" as you jumped, as it wasn't easy on the eyes. But that's just my personal opinion.
Overall though, despite having plenty of room for improvement, it was a decent game. It's not bad, but by virtue of being incredibly simple, it's not really doing anything extraordinary either. But, with some tweaks and improvements, it could easily become something more.