Guimo
 

This is a run-and-gun platformer from 1997, says Mobygames. From looking at screenshots, it looks kind of like Jazz Jackrabbit, but it focuses a lot more on gunplay than speed.

I've got the game and screenshots, and I'll start on the review if this request is accepted.

Is it a CD/CD image?

Not from where I've found it, it'll be in a .rar. If that's all right.

Published by: Cia do Software
Developed by: Southlogic Studios
Released: 1997
Platform: DOS

No buylinks found. How big is it?

Let me use my Great Filesize Estimating Power™!

... ... ... 6.87MB, it is!

So, is this game accepted? I have the game (15.5 MBs) and the screenshots ready. I just need to do a review.

Guimo
 

So there is a game that I played as a child, I remember it very well but can't find it's name. It's kind of weird that I can't find it's name because I remember a lot of details.

First of all it's a side scrolling platform game from the 1990's.
You play a green guy in an armor which seems to be an alien.

I remember that weapon number 2 shoots some sort of spinning spirals.
I remember that one of the weapons shoots bots that help you in combat.

One of the levels, I think it was level one, is in a forest with huge trees that got huts and bridges built on them, and you can go underground.
And I think level two was with waterfalls, and you had to find a scuba-diving equipment in order to enter a vortex and get to the boss.
There also was a level in a castle-like environment, and another level in "computerish/electronics" environment.

The name I recall is "Agumons" or "The Agumons" but I can't find anything like that.

After searching on "Home Of The Underdog" I found it!
The Game is called "Guimo".

http://www.pedroleite.com.br/guimo/guimo6.jpg

Approved.