The game would be more interesting if all of the clues were needed. There are currently too many clues, making the game a bit too easy. Also, the game freezes, especially on the later levels. It even crashed once.
The "Rising to the Challenge" Achievements are not counted towards the whole challenge achievements. You can see it for yourself: go to in-game achievements and click "Challenges xx/105". As you can see, there are actually 115 challenge achievements.
I unlocked all ten weapon and player upgrades before level 8 and noticed I can't buy more. Then I bought another loadout thinking it might allow me to buy more upgrades. Well it did, but the upgrades won't stack. I feel a bit dissapointed. I have 3 levels left and can't basically buy upgrades anymore. I'd really like to be able to buy full upgrades, since the game gets more difficult as new, spitting enemies appear.
"The browser could not allocate enough memory for the WebGL content. If you are the developer of this content, try allocating less memory to your WebGL build in the WebGL player settings." Huh.
How can I fix the height of the in-game window? It should be extended, as the Kanoapps games have, but it won't extend thus I can't see all of the game feed. What should I do?
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Thank you for the report! The team is aware of the WebGL memory issues and is working to resolve them.