I got Umbrella Chronicles and for an on-rails shooter, it's pretty good. Your main weapon is the Handgun, which has unlimited bullets. But along the level you can find ammo for different weapons like shotguns, machine guns, and you can use them to and switch weapons on the fly to match the situation where it's needed. Ammo is scarce for these weapons, so it's best to use your handgun as much as you can and use your other weapons when necessary like when crowded by zombies or facing Hunters or Chimeras.
The game covers all the important plot events in Resident Evil 0, Resident Evil and Resident Evil 3 while also touching on unknown things like how Rebecca did in the mansion before she was found by Alpha Team and how Wesker escaped the mansion. We also play as Ada as she escapes the city with the sample of the G-Virus and even cover HUNK's escape.
The game also includes a brand new Scenario, covering the final events that led to Umbrella's downfall. Including a look at Wesker's agenda on what he wants and how he gets them.
The game is very fun with a lot of objects in the background to destroy to find weapons, ammo, files (Which add more to the story) and recovery items. So you'll spend a lot of time shooting objects to find files and ammo.
The levels also have secret rooms (Which you access by finding the right door and shooting it down) and alternate paths which you take depending on your choosings. You'll find yourself coming back for more to fully explore the areas, get better rankings and star points to upgrade your weapons.
I really recommend this game to Resident Evil fans and on-rail shooters fan. It's surprisingly challenging but very fun, especially when playing it in co-op. (My friend and I had a blast playing this together today.)
Any other questions regarding Umbrella Chronicles I'll be happy to answer.