These are cheap and cheerful, in a great way! Fun music, polished version of each concept, clever use of scoping to give yourself room to expand into other minigames if there was time, but still let you ensure you released something finished.
Needs to be a button back to main menu at game end.
Shopping game would benefit from showing the prices instead of needing to hover to see them.
Roller coaster would do well with alternative arrow up/down controls. Some of the clicks didn't seem to register. Also the moving track animation is a bit rough on the eyes.