great for the first go!
this was a awsome game man, you had everything a game like this needs its a low sandbox game. upgrades are not needed for a sandbox game more levels are not needed really you should drop the advancement you have as in when you beat level 1 you can do level 2 difficulty just go with a straight game that gradually gets harder. good game and if this was just your first then i am going to have to keep my eye on you.
so to put it in shorter words
1:make it a sandbox game don't stress about the difficulty just have a straight forward play the gets a little harder every now and then.
2:maybe consider a different name i didn't see it as a problem but the guy down there did and he could have said it without being such a _____
3: man a few different kinds on enemies would be kinda cool like just have some with a slightly different shade of gray and a sword or ax or something
honestly if you hadnt have mentioned this was your first game i would have given you like 3 stars its not the best its not the worst but its not really good but this was very good for a first game and i have to congratulate you on it *clap clap*