The sensitivity was very low, a mouse sensitivity slider would help a lot. Also visuals are a huge part of any game - its the first thing that anyone will notice. Im only the programmer of my team, so when I do a solo project, I'll usually use free assets from the unity asset store (Theres a lot of free ones you can use and they're pretty good).
A menu button and exit game button would be nice to have in the death screen as well since I otherwise have to Alt+F4.
Capturing the pals also didn't seem to work.
Lastly, The Pals would attack very quickly, not giving much time for me to react.
Don't worry about it too much, just keep making games and you'll naturally get better as you study and program more!