What a neat little game! The atmosphere you set with the visuals, the fog and the music was very good. The controls were and the objectives were clear, which matters a lot. One issue I had (which might 100% be specific to my system) was that the aim sensitivity was too high and I didn't see a way to change that in options. I also thought the appearance of the T-Rex was very abrupt - unless I was too dumb to notice it coming while smacking the mushrooms :)) But I'd expect a beast such as that to at least make some thumping noises. So it was a very sudden Game Over.
In the end, this was one of the better entries in this jam. You guys are are obviously talented and I hope that you keep making games.