I have played it, I can say the egg exists. I have no screen shot to prove it ...
It's an interesting little game. I did spend a good time playing it, but there are a few things that could be addressed.
Movement is fast, but it feels floaty and uneven at times, you feel like you move slower near the portal, and the static background makes the movement jarring and you loose all the sense of movement and place. Many times I was never sure how far from the mortal I had moved.
I also feel the camera movement with the aiming should be in the opposite direction so that you can see more in the direction you are aiming. For instance if you are moving left and aim left you just stick to the edge of the screen and you can't see anything. if you are moving towards the portal, not even the arrow that points back to is visible. Up and down is even worse as you have less screen space.
The upgrade system is nice, but there is not much feedback on how far you have taken each upgrade. The only exception is movement speed, it would be nice to have a similar indication for regen and the other upgrades.Sure you can see their effect, and as there is no cap that I could find that is OK I guess, but if I'm aiming for a specific build I have no idea how close I am to it.
It also did not feel great that all enemies drop the same amount. Sure at late game they are all one shoted, but early on it feels strange that harder enemies give the same reward as easy ones. The difficulty could also be made to scale with the progression. enemies could also scale, or even just give damage over time upon contact instead of just on first contact. That would make the game interesting for longer.
There are also things you can expand upon, maybe some multishot or scatter, or different attack patterns. So I will look forward to any updates and goals you add to the game.
Still don't be discouraged by my words. The game ran smoothly even with a ton of enemies on screen, it had tones of fun moments and personality and it shows that you are on your way to do great games. So keep at it, you are on the right track.