Thanks a lot for every bit of feedback! I'm very grateful for it.

Changes:

Big:

- Enemy projectiles are much more visible

- Damaging zones, like poison cloud, doesn't hit you instantly. Instead, at first they warn you by tinting your screen in respective colour (green for poison cloud :))

Balance:

- game is a bit easier now on default difficulty level

- Amount of hearts you start with depends on the difficulty

- Ent has more HP

Small:

- Removed delays in the dialogues- responses show faster

- Changed a bit of text in the tutorial

- New, hidden achievement

- graphic change- now, the doors are by default closed

- decreased game file size a bit

Bugfixes:

- fixed map borders on top/ sides of the map

- some UI fixes

- disappearing keys

- mushroom monsters should not stuck in the ground