hi,
I played your game. To be honest with you, your lack of experience can be seen in your game. This doesn't mean you should give up. It means that there is still a lot to learn. I would suggest making your next game in 3d because you are using a mouse and it is really hard to draw with a mouse. On the other hand you can also make games with pixel art. Finally i would suggest you watching unity scripting beginner series. The really helped me out when I was making my game.