The concept may be good, but what do you think?

Hello. I have concept of a cool game and I think the description gives it right. I am jmust getting started and this project is for the Boring Pixels 7 game jam.

Here are things I need to do:

1. Optimize the concept

2. Make basic graphics for everything

3. Make mechanics(I have planned to add a character with one ability for the mechanics to revolve around and mixed gameplay- building, strategy, shooter and open world).

Any suggestions?