Pretty cool! It's very nostalgic to me playing this, it reminds me of those flash games back in the day where each run you get more money for upgrades, like that penguin flight game and also those catapult games I forgot the names of. For your first game, this is really good. Some music would've really wrapped up everything together. And having the upgrade menu be more seamless rather than sending you back to the main menu to do it would've made a much more cohesive experience (this one doesn't require all that much work, it would just need a new menu that doesn't say it's the main menu).