I#'m not being funny but i started playing and have lost the first level twice, there is minimum imput from the user and this point and it can win the level. Try designing a game that is not like the genreric click with your mouse wait idle game. GET SOME ORIGINAL IDEAS NOOBS!!!!
If money is the only objective in this game then the game should end around level 3.
You could try add in a upgrade shop menu and upgrade such things as speed and maybe a backshoot upgrade.
And the game speed seems a bit slow.
3/5 good start for a game but i think it needs work.
Good game and it has alot of room for improment, Maybe if you added a upgrade/shop and made the game longer maybe do it as missions on a bounty board to earn money.