I think you need to have a look in the voting thread my friend
Although when it comes to Alien Breed 2, I think the ECS and AGA versions are actually a bit different to each other. I had a look on AMR and it appears that the AGA version has more enemies on screen compared to the ECS version and therefore is more difficult. I've just briefly been playing both versions myself and maybe it's just my imagination but the AGA version is a lot harder - there's definitely more going on...