first of: you ask for feedback and you will get it. It might be a bulk of information, which doesn’t mean “everything is bad” but are mostly points to think about. I also do not review it as an intern application, there I would be more lenient, but having a grasp what to look out for will help you in the future
It looks like you dipped your toe into different disciplines, which is good in my books. But now your portfolio looks unfocused to a lot of people. Make a portfolio for the role you are applying to. Later you can still drop a link to the other stuff, but the first impression should show a main focus.
I quickly skipped through your stuff. And the the first thing: show effects in some context! One page, had the effects super close in a void and then in context. do it the other way around! They looked fitting in the game but up close I literally thought “meh”.
It seems as if you made some environment art, so you are capable of creating a little scene to better present the VFX.
Name the purpose
Some of your effects are under one headline like “Niagara effects”. RTVFX always have a purpose, if it is gameplay feedback, gamespace feedback or to enhance the mood of the scene. Some of your effects, I could not get what they supposed to be/do.
A “Debuff attack” , “Jump Feedback”, “Turret laser attack” would help put it in context in my mind. Making me able to grade it much better.
It is great, that you can show that you have worked with Houdini. But if the result is not in a game engine it would mean nothing to most recruiters. (for film VFX maybe, but not for RTVFX in games).
If you made the most amazing simulation in Houdini with a great looking render, but it cannot be used/recreated/implemented in the game, what worth does it really have?
On the FX themselves:
It seems, that you understand the general technicalities, but a weakpoint seams to be motion/timing.
to help with this, play around with some animation curves; look at some other effects and try to analyze the timings of them; make sounds with you mouth! This gives you a better feel on how long some things really are.
Big gifs tend to be also really big in size. I recommend making mp4 instead, or even better: upload it on vimeo an link it. Getting gifs “look good” while still being a reasonably size is quite time consuming.
I hope these pointers help. I wish you all the best and good luck on finding a proper internship