Gonna design an arcade game that has achievements and stuff but really it's just an IDE.

Achievements will be things like:
Hello World
Ran without throwing an error
Wrote X lines without saving (this one will be tiered)

Achievements earn you points that you can use to purchase pointless things like stickers and decorations and new themes and syntax highlighting.

There will be NO microtransactions. Microtransactions are ILLEGAL.
Also you'll lose points for programming anything with microtransactions.