The minigames are very fun and engaging for the most part, and the art style and UI really hit the mark. I also like how the level selection was designed. Collecting minigames like items throughout a run gives an appropriate amount of variety and choice, while also giving you enough time to get familiar with each and ensuring that your decisions have a lasting effect. 
My biggest point of criticism is the balance between minigames. Some are just way too easy and lack any risk (namely mirage and forest), and even though I thought voyager was the most fun, it's definitely significantly harder than the others.  The copy could follow your cursor with more acceleration/more closely to make it feel a little more responsive. Most of the limited-shot minigames also give you too many shots, especially the forest.

Overall, lots of room to improve and a well-thought-out base!