When comparing Pappu Pakia vs Freedoom, the Slant community recommends Freedoom for most people. In the question“What are the best open-source games?” Freedoom is ranked 38th while Pappu Pakia is ranked 95th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Good for quick play sessions
A quick game that is light on depth being casual game that one can jump in and out of with no issue.
Pro Easily played on any device
Pappu Pakia is an HTML5 game which means and there is no download required. Anyone can play it in an HTML5 compliant browser as well as it's own webapp from the Chrome Store (as long as one has Chrome or Chromium installed).
Pro The Doom feeling without the proprietary data files
Pro Thousands of available mods
Pro Easy mod creation
Making new levels and even gameplay mods is fairly easy and requires no programming knowledge.
Pro Easily moddable
You can apply mods others have made in a straightforward fashion. Find a mod you like (either from a quick google search or checking moddb for some) and the individual mod pages have a "tutorials" tab that you can use to figure out how to install it. It differs from mod to mod, but in most cases, it's fairly simple.
Pro Well documented modding possiblities
There are numerous tutorials providing detailed help with the modding and wikis providing extensive information on all aspects of the game