펜 누르기KnockingPen

I am a novice developer.
I plan to make this and that, and this is the first work I am showing to you.

It has been implemented so that the interaction with the pen is as close as possible to the real world,
You can earn a variety of pens by completing hidden achievements.

Thank you for your attention.
Opinions about the game are actively accepted.
Any feedback would be appreciated.