Interesting Project. It would have been helpful if there was better information on how to play and what the upgrades did. Maybe a small write-up might not be a bad idea?
I noticed a bug: Your 'money' is always displayed at 1 when you start a new round, regardless of how much you carry over.
You 'might' also be pleased to know that I played this on a Windows XP system and it did play. The only downside was after 10 minutes or so, my CPU was running at over 90%. I think it has to do with the engine you used.