You kept at it longer than me, and I sank 40 hours into it!

(But also do play Dome Keeper, that's one of my favorite games. Also an inspiration for Dice Tower. :) )

Those are good places to start.

The more experience you gain, the better senses you develop for when to make a system. Contrariwise, if you spend too much time thinking up systems without having that experience, you risk designing systems that are brittle when put into use. It's a balance you can only develop from doing things.

As a beginner game dev, don't worry too much about coming up with good systems. Start with making a game, and pay attention to how often you are reusing certain logic. That's a sign that it should be made into a system.

Thanks @kenney.nl for all the icons!