Just get the DLC, guys, and prepare for some more Cuphead goodness. The animations are spectacular, the OST is jazzy, the challenge is guaranteed, and the new character, weapons, and charms are super cool. Even better, you can use them in the base Cuphead game. Again, THIS is how you do a DLC.
It's an action-packed DLC that does many things better in terms of gameplay than Serious Sam 4, a game that was mediocre at best (if you could put up with the slog during the 1st half of that game, you're in for some old-school Sam action in the final 3-4 levels). The main problem I have with this DLC is the setting. I understand that Timelock Studio (the guys who worked on Siberian Mayhem) are from Russia, but man... choosing Siberia with all that snow, fog, and boring oil rigs and obsolete structures is the complete opposite of what we've grown to love about Serious Sam - The First Encounter, The Second Encounter, and even Serious Sam 2. It's like Croteam (and everyone else working on the series) forgot where the older SS games took place and are now competing for the most bleak level design. If you can get past that, Siberian Mayhem is probably the closest you can come to reliving the old Serious Sam action from 2 decades ago. The enemy waves are fun and challenging, and there are both new monsters and weapons that are always welcome in a game like Serious Sam.
Yes, it will remind you of old-school shooters the likes of which are very rare to find nowadays. Yes, it is action packed and if you've played any of the build engine shooters, you'll feel right at home. HOWEVER! It just lacks a bit of that magic that made these shooters so special. The level design is decent, but I can't help but feel it could've been handled better. And the music? I'll think I'll pass. Still, Project Warlock is a good game and at the price of $12, you really can't say it doesn't provide you with good value for the money.
An underappreciated game that was released at a time when making games in 3D was very risky. It downright destroyed several franchises that used to be "immortal" up to that point. If you are ready to look beyond the 3D decision and the bad camera, Earthworm Jim 3D can be a fun experience. Your call.