-Definitively shorter compared to the mainline games: 52 missions in total (EDF2 had 70-ish missions, EDF3 reached exactly 60, EDF4.1 contained nearly 100, and EDF5 had a whooping 110)
-NPC allies are utterly useless as they will shoot in the opposite direction where the enemies are located most of the time, and never downwards or upwards. They don't even make good decoys because the aliens and giant insects will often focus on the player only. I even suspected my allies of killing each other through friendly fire.
-You can easily get stuck in a loop through stuns, frozen status, grabs, etc as, unlike in the mainline titles, there are no "invincibility" frames in a short period of time once you're back up on your feet. Status effects such as poison (from giant scorpions) progressively eating away your HP were also fucking gay.
-If an enemy corpse is located behind your character model but takes up your entire screen, the game will no longer register the hitboxes of anything you shoot forwards.
-I know people complained about grinding certain maps for high-end weapons at random in the mainline EDFs, but Iron Rain takes the idea in an even worse turn. Weapons appear in the inventory upon completing a certain mission (no idea if the rank rating for your personal performance has an influence) but you need money and specific gems (blue, yellow or/and red that are dropped by aliens/insects) in order to actually unlock them. The problem arises with B-rank weapons that generally need 100k bucks at least when a mission on Hard difficulty awards you at best 30k-40k.
-Increasing your own HP bar also costs money as armor boxes don't appear in this game either.
-Using items like grenades, vehicles or self-healing will penalize you by reducing the total amount of money rewarded.
-Damage output of the weapons was frankly garbage compared to the large HP pool of the enemies. Always took me a full cartridge of an assault rifle to eliminate a mere ant, or two at best, in Hard difficulty. I ended up using the heavy armor PA-Gear class (the "Fencer" class which allows dual-wielding your equipped weapons) in the last row of missions so I could handle whatever the game would throw at my face.
-Elite versions of certain enemies are also resistant to a specific type of weapon (grey ants for example can tank laser weapons) meaning the game encourages you even less to experiment unlike in the regular EDFs. As if spending large sums of money to obtain just one weapon wasn't bad enough.
-Final boss (divided into two separate missions) was bleh
-Probably a problem of the PC port itself but pressing too many keys at once would make my character move towards a certain direction without any further input from the keyboard. Happening to me a few times.
