I really like the concept that you're working on! I love Neir and love to see more devs making games in that style/gameplay!
The character swapping mechanic was cool and could be used for some interesting gameplay. The animations were also smooth.
I think this game could be pretty cool, but I hope you will work on finding your own art style (as apposed to the vroid/default anime style) before going too deep into the mechanics. This could really be something special just going off the ideas you put out!
Excited to see what you do!