Good game, reminded me of Serious Sam, especially the sounds of jumping. The graphics are cool. But there are a couple of things that can be improved:
1) The crossbow is received later than the shotgun, but it feels weaker because of:
- Deals the same damage (needs two shots for radiation);
- Reloads longer than the shotgun;
- Only one bolt in the clip;
- The bolt drops too much with distance; There is no piercing effect like the shotgun, when you can kill him with one shot at once;
2) Enemies often can't do anything if the player is on top (or in any other unreachable place), I think in such cases they can be added to throw projectiles at the player;
3) The secret next to the lava is cool, but there is no death collider there. I also noticed that if after getting the crossbow you return to the same room with lava and collect resources from above in the passage before the purple key, you won't be able to go back.
Overall, I liked it, good job!