This game looks amazing, but it lags my computer so hard

Wow.... I really tried the game and I will start by saying the good parts and then the bad parts... The good thing about the game is that it is looking decent, the music is ok and the concept/idea of the game is really unique.

Unfortunately I couldn't be able not to observe a lot of problem with the game, so I will try using also screen shoots and explain for some problems what is the problem and how should be fixed... So the problems I found about the game are the following :

1.During the first level when I encountered the first boulder, I tried pressing it to see where it is going and it actually opened the door to the second level after the boulder was able to reach a mechanism... The problem was that I was walking in all places and even tried to jump over the door to the second door (I couldn't and I give you credit for that), but it took a while to understand what I was supposed to do to open the door.

2.The game didn't have any pause menu and I found it difficult to restart by exiting and re-entering the game. The "R" button restart just the boulder positions, but I highly suggest you to create a new option that restart the player position to the last checkpoint.

3.The concept of the game that it let you change your gravity is both good, but also really bad, for example I was able in the second level to jump out of bond and discover some small little problems... 

Did you think that I stopped there ? Nope... I tried to see how well the game kept the player from the outside world, but then I found this :

I really enjoyed the view especially with a good coffee in the morning... Aaaahhh to be a beginner dev... I also found this :

Beautifull isn't it ?

4.During my "out of bound journey" I discovered a little problem with the boulder (but it is optional).

5.Returning to a specific screen shoot, THE LIGHTING IS LOOKING WEIRD. In the following image you can see that there are some lighting rays that are not supposed to be there, because there are no openings in the rocks, so the problem may be from the way the boulders are constructed... Maybe that inverted/not-existing face let the light pass through some boulders...

6.I didn't know what to do in the last level, because I tried pushing both boulders, but still they didn't open anything and they just remained underwater... So I did what I knew I did the best and tried to force my way to those 2 gates, but unfortunately it didn't help me at all and what I passed the second gate I remained in that corner without the possibility to jump back and had to re-enter the game because the "R" button didn't reset the player position and also because there was no pause menu.... I will put some screen shoots, just in case you think I am lying...

7.During my jumping over the gates (mentioned at number 6) I also saw that the water wasn't moving and it didn't bother me, but still, the use of some shader code will make the game more worthy to be called and "AA game". I put an image below as reference...

So that's all I could come with the problems in the game... This comment isn't meant to judge you for your problems, I am just a chill guy that like to rate beginner devs game so much that I want to show them how dedicated some players may be.

For your first game it was an amazing idea and it had a nice concept, the single problem that it really need to be solved is the way the player is guided... The player need to know what those boulders do... I myself tried to figure it out but it was without success... Then when I was out of bonds I realized that there isn't any next level so I left it as it is... So good job, and be carefull with these mistakes, because it may ruin the experience in the game a bit... 

Also the itch.io page f the game is just plain white and it make it look boring and also during the night, it may be a bit too powerfull for some players eyes so a darker tone to the game's page would be a really good way to make the game look better.

Good job again, and hope to see a reply soon.   :D