Thank you for this feedback Ricky! I think we should've done more QA testing on the game, to catch out bugs and gameplay flaws like this, so this is something which I will make sure to do on my next game projects!
You are indeed buying several 1's, the level wasn't planned to increase at all, so I added this onto our Trello board so anyone could work on this in their spare time if they wanted.
The spacebar as an input is something which we didn't catch out on during testing! This makes sense though because the animal is a button, this has been added onto the trello board to either be implemented or removed.
The number being a float was one which I was confused about as well, this will be something which I'll bring up with the team!