Pretty interesting, I think collecting mushrooms and bringing them to an exit point is not bad. The enemies felt like they spawned out of nowhere, and sometimes they had enough momentum to run into me without enough time for me to react. Maybe slowing them down or having a map to show enemy locations could help with that.
Having other weapons was a nice touch, I think they could have been re-balanced, as the rifle didn't feel strong enough to justify the reload time, and the boomerang felt very strong. Still, this was a pretty solid entry, good work on this!