Played through most of the games, here's the summary of my thoughs
Fishing: A bit confusing, tutorial wasn't very clear. Might be ESL moment (on my end), but I missed the part where I had to fight with the fish with left-right presses
JRPG: Alright, but is too easy - finished it without having to use the controls. Also I feel like it can be expanded into it's own series of games? There feels to be more opportunity to use it than just combat.
Dancing Wizard: WASD controls were horrible, especially with the UI being vertical. The other control scheme was fine. Music is alright, but needs a lot more feedback from correct/incorrect note presses, preferably on the circles. Also when the circles just move - it's a bit hard to gauge when it's gonna hit the target, would've preferred if they were not only moving, but also growing in size. And the third challenge starts off VERY fast, you'd want that for the chorus, not for the beginning.
Dragon flying: It's alright, I liked it. Dragon snapping his neck is pretty cute. Collision boxes for rocks seem to be a bit too large though.
Shooting minigame: Was alright until you started spawning targets in random places and then replacing them with red targets. Wasn't fun. Also - there was no feedback for shooting, so when they were randomly spawning - no idea whether I hit them or they despawned. Some patterns (when the targets were moving) were pretty cool though.
Tongue twisters: No opinion, I'm ESL and I didn't know those twisters, so they were hard, especially when I had to cross-reference names.
Imp Launch: Falls too fast, basically uncontrollable.
Tower Defence: Extremely barebones. When you introduced new towers it was basically up to trial & error. I might be spoiled by BloonsTD6, but I dunno, it wasn't very fun. Not knowing what the tower does before you place it is not ideal. It could work for WarioWare-style game, but yours seem to be more "level-based" than "think fast" time trial based.
Fairies: A decent attempt at a shmup, but "eternal shield" without any penalty feels wrong. Also bullets move too fast, and the collision seems to be the entire fairy rather than a single point.
Some of the minigames are fun and promising, others - I dunno. Needs a lot of tweaking and polish imo.