Hi,

First of all I love this game, it's just so much fun.

But while playing I realized that the game was hard and easy at the same time. Let me explain, I feel like if i play the intend way by exploring and building defence the game is slow paced and hard because you have a lot of place to control. 

However if you play in a "rush" way (not doing any defense and just trying to progress as fast as possible) it seems like the game becomes a lot easier. I only had to build some generators , then open as much door as possible during the first wave to get as much ressources as possible and then i just had to build one defense for every door that had to be unlocked. So basically for every wave i was only protecting the crystal.

When playing this way the need of generators and research station is close to none, which i believe is sad when a part of the playful tension comes from the need to protect them. (I will try that specific "rush" way a little bit more to make sure)

Therefore i was wondering if time could be a better factor to produce ressources than juste the door you open? (in order to make sure they stay usefull)

(It's not really a problem but it feels wrong goes really too easy to do)

Also wouldn't it be intersting to let the player use ressources to close doors.

This is intended behavior. If you play fast and take risks, you get rewarded.