What a lovely little game! Haven't explored much yet, but it's nice to see various extra mechanics and details, like toys given to Chao speeding up it's energy regen or jumping minigame having a Stomp to avoid spikes easier (and secret Tails) or Power minigame having bonuses for consecutive Perfect taps to rhythm. Halfpipe seems to be the easiest game to cheese because same tactic as for Sonic Colors DS special stages works: you can tap screen instead of dragging finger, and there's only two spots - lane 2 and 4 - where you need to be to avoid anything. Went for 3k+ rings out of curiosity, want to see what happens at 9999+. Could be avoided by having variations of spikes with hole only in the middle or in the sides, but seems like it's already hard enough for other people (and i can't reach the very-very sides of halfpipe on my phone because of the screen size, side holes might turn impossible to many people). Oh, and Swimming minigame has a fun visual bug of holding finger above Chao instead of below and watching him turn around while still swimming down.
A bit sad about lack of Chao types variations, but that would require many sprites redraw. Maybe something to hope for in distant future? And lack of finish line or winners podium in Chao Races a bit sad, feels like a much easier thing to implement in comparison.