Great job! I really enjoyed myself and I thought that the puzzles were really well designed. You took an interesting twist on the traditional puzzles and escape rooms and made it so that the player had to control three different mummies, each with varying sizes and abilities. The music fit the theme of mummies and ancient Egypt really well, it was a great accompaniment to the game.
The pivoting with A and D threw me off a bit, I was expecting WASD to be forward, left, backward, and right, respectively. I also think that it would be easier if the player could use their mouse to move the camera around, instead of having only two camera views, forward and top. In addition, I think actual mummy models would fit the artistic style a bit better. I really liked the "maps" (for lack of a better word) and I feel like the colored cubes didn't quite fit in. But those are just minor adjustments.
I think that connection with the theme "Death is only the beginning" was a little far-fetched. I get that the story kind of covers it, with the mummies getting revived, but I think that it would've been better if the gameplay incorporated the theme a bit more. Perhaps one continuous map, with the ending points "killing" the mummies again, making them respawn at the beginning, and adding a new section of the map unlocked and more puzzles for the player to complete.
That's just my take on the game. I had a lot of fun playing this. Overall, really well done!