Amazing game, well crafted I managed to reach the end after several hours. I really loved the narrative and the way you slowly get your suit fixed while you see unreachable parts in rooms as you play to know to go there after the suit upgrades. I am also stunned by how big the game is and how the rooms are reused over and over again to lengthen the game.
I would have added more shortcuts though and indications in the map to where the batteries are (as soon as they have been discovered first) because it was really tiring to traverse through rooms again and again to find them again. Also, the checkpoints were at times annoyingly put in places where if you mistakenly went to a room where you thought there is a battery and there wasn't, now you can't die on purpose to go back, you have to go back room by room again.
But overall it is a great game, it took me 3-4 hours to finish but it kept me playing. There were times I wanted to just save the game and play it some other time (especially when getting tired to find again the batteries i saw at places before).
Well done!