Starbound Struggle - Astronaut vs. Umbrella

I have never made a game before, this is just a prototype, so please let me know any suggestions you have on how to fix it, or any bugs you find. 

Credits for assets used:
https://assetstore.unity.com/packages/3d/characters/little-ghost-free-229325

https://assetstore.unity.com/packages/3d/environments/low-poly-alien-world-13232...

https://assetstore.unity.com/packages/3d/characters/humanoids/sci-fi/stylized-as...

some sounds were also used, but I cannot find their creator.
Music created by me

All code created by me
:)