Just want to know how long this is. If it's at least 4 hours I'm in.
Based off of completing the main game as Beck, it'd probably take you about 3-4 hours to blow through the entire game as both characters. I haven't played through the game as Gunvolt yet.
There's a hard mode that unlocks after you beat the game. There might be a third unlockable character? I'd say all in all, you're looking at 8-10h if you want to 100% complete the game.
Edit:
The game is okay. It's can be challenging or infuriating at times. The UI is customizable if you don't care to look at how many times you've died or how long it's taking you to beat a level.
Mini-Review of Beck's Campaign:
I didn't care for Beck's weapon system. I thought that all of the weapon tweaks were too granular and complicated. The game offers little to no direction on what to do with all of these different attributes or where to apply them. There was one level with invisible platforms that only cued you in on their location if you hit them with your weapon or an enemy was walking on them. The bounce shot helped navigate that small section.
The levels didn't encourage experimentation. Progression didn't feel organic because you're given all of the weapons at the beginning and instead given points that allow you to equip more attributes or new attributes entirely (like bounce shots, delays, wave beams) to these weapons. You don't beat the fire boss and get the fire boss power. There isn't any Mega Man logic to this game even though it's very clearly inspired by the NES Mega Man games.
There's no quick way to switch different weapons either. I would think that the shoulder buttons would allow for a drop down while playing but you have to navigate to the customization menu in order to select a different load-out either before or during a level. Each main weapon has a ton of sub-menus with different attributes. If you want your wave beams to be long or short, go for it. If you want your homing missiles to have three different modes of sensitivity and a 90 degree turn ability but goes slow, oh boy, this game's for you.
It's like a more complicated, unnecessary version of Plague Knight's alchemy from Shovel Knight.
In the end, I ended up using homing missiles and the air dash attack to just spam dash/attack my way through the latter half of the game.
tl;dr didn't like how weapons were handled. design felt sloppy
The graphics and music fine. The combo system in order to gain points for a better letter completion didn't make sense for Beck because he uses ranged attacks and combos require you to stand right in front of an enemy to defeat them. I'm going to assume whoever designed the Gunvolt portion of the game couldn't have been bothered to tweak Beck's side of the game?
Bosses have patterns and I didn't find anything particularly cheap or difficult. Again with the weapon system, I didn't think there was any particular strategy once you have homing missiles. There's a strategy to avoid them but actual elemental weaknesses, no idea. Bosses didn't have any personality or dialog. It might be what the game lacked. Gunvolt and Beck + the final boss had dialog but the main bad guy's dialog was too meme filled and forced.
Beck's campaign was just okay. Middle of the road. The level design is serviceable and works for basic platforming but don't expect anything special.
Edit 2: The game's humor.