Unique concept! props for thinking outside the box with the theme. This is a decent foundation for a game as it gives you plenty of things to engage with as far as mechanics goes. I have two big categories I think would greatly improve the experience and make it excel:
Compelling motivation
Players want to play for a reason. It's extremely hard to keep players engaged with your game unless they have an interest in playing it and playing it well. This really boils down to which of the 14 forms of fun you're targeting with your gameplay. In your case you seem to be targeting intellectual problem solving in the form of optimization. Other examples of what this would look like is giving the player a goal they are striving for, like some location to reach. If that goal is simply to keep the little dude alive then you've gotta make people care about that little guy more than anything else in the game. You should make him adorable, lovable and anything else you can do to get players attached. I'm rambling but the gist is: determine what is compelling about your gameplay and lean into that hard
Player feedback
That leads me to player feedback which I think would be the quickest and easiest way to take this idea up another level. Make it trivial for the player to always understand what's going on. For this game that would mean centering the most important elements more clearly. Move your current amount of money so that it's front and center in big letters because that's an incredibly important piece of info. Instead of having the player increase speed gradually over time, making it hard to notice: stair step the increase and add effects to telegraph to the player when the speed increase happens. Anything that helps to more clearly communicate to the player the current game state is a win in a fun hectic game like this.
That was a lot and I hope you don't feel like I'm being hard on you, I'm writing so much because I see the potential! This game has a lot of polish and an intriguing premise, so you should be very proud. Great work, keep it up!