[Free]Time-stop puzzle adventure game(like Matrix effect)

Hello, I'm an indie game developer.
Yesterday I released my first project on google play store.
I thought it would be fun, but my people says my game is difficult.

How about you guys? Please look over my game, and tell me something..
I worked on it more than eight months(creating and learning C#, Unity).
I wanna know what you guys think about my game...is it difficult? or doesn't fit in mobile?

The game is 3d puzzle adventure, and FPS style.
And I took care about "Time freezing effect". It's beautiful..(I think)

Here's my game trailer movie
https://www.youtube.com/embed/vhq9EMuHpnw

Google Play Store. The game is free(include ads)
https://play.google.com/store/apps/details?id=com.dreamyTyper.timeStopper