Really great game!
The concept of surviving with caffeine and using doors to battle enemies is really good! It was really fun running around beating robot co workers. The art and music look really well put together.
I have to say, like others, that difficulty is a little bit too high. One of the major problems is that the amount of time that it generally takes to clear a room is higher than the hp up the coffee gives you when you clear it. So, you're constantly going lower and lower, that is if you don't get hit. There are very few rooms which have extra coffees lying around for you to get. I think that adding more of these, and potentially dropping more than just one coffee after clearing a room would do great.
I really liked the idea of having two types of door, one big and slow that does a lot of damage, and one small and fast that does less damage. However, I have to admit that the combat didn't feel that comfortable to me. Sometimes I found it hard to swing my door and hit enemies.
Overall, really great game!