Thx! The art was made by 0x72, there's link to his work on the game's page. But thx for noticing weapon animation! I was kinda amazed how easy it was to make.
Timer will make a game more tense and, as you said, the game should be playable for non pros(like we are xD), and the last level is kinda big, so I can't pass it first time every playthrough, feels like pure luck.